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Bolt Circle With Odd Number of Holes Within Circle
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For more quations and illustrative graphics see:
Measuring Large Bolt Circle Equations and Review

Bolt Circle With Odd Number of Holes Within Circle

To measure the unknown distance x over semi-opposite holes using pins (largest gage pins that can fit into holes) and the number of holes n is odd and greater than 3, and the distance c between adjacent holes (pins) is known as shown left in Illustration C, use the equation:

Bolt Circle With Odd Number of Holes Within Circle


c = the distance over adjacent pins
d = the diameter of the holes
θ = 360°/n or angle between adjacent holes.

All units shall be consistant and given in inches or mm. Angles (theta) are given in degrees

Distance over alternate pins (c) =??
Diameter of holes (d) =
Angle between adjacent holes (Theta) =
Distance over opposite pins (x) =

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